Commercial Marine-Degradable Polymers for Flexible Packaging

Abstract

Plastic pollution is entering the world’s oceans at alarming rates and is expected to outweigh fish populations by 2050. This plastic waste originates from land -based applications, like consumer product packaging, and is composed of high -durability polyolefins. These conventional plastics possess desirable properties, including high chemical stability, moisture barrier, and thermoplastic characteris-tics. Unfortunately, if these materials reach marine environments, they fragment into microplastics that cannot be biologically assimilated. The aim of this review is to investigate commercial polymers that are biodegradable in marine environ-ments but have comparable product stability and moisture barrier properties to polyolefins. Among commercially available biopolymers, thermoplastic starches (TPS) and polyhydroxyalkanoates (PHAs) have been shown to biode-grade in marine environments. Moreover, these biopolymers are thermoplastics and possess similar thermoforming properties to polyolefins. At present, TPS and PHAs have limitations, including chemical instability, limited moisture barrier properties, and high production costs. To replace conventional polymers with PHAs and TPS, these properties must be improved.

TSC Opinion

Cet article fait une revue de l’état d’avancement technique des polymères de type PHA et comment ils peuvent substituer les plastiques utilisés pour les emballages alimentaires, en particulier, le PET et le PE qui sont souvent utilisés pour fabriquer des matériaux composites difficiles à recycler. Les filières de recyclage du PHA n’existent pas, pour l’instant, mais dans le contexte actuel ils se dégradent rapidement en cas enfouissement ou de perte dans l’environnement. En particulier, il est l’un des seuls polymères qui se dégrade facilement au milieu marin.